EP2841106A1 - Topical formulation compositions containing silicone based excipients to deliver actives to a substrate - Google Patents
Topical formulation compositions containing silicone based excipients to deliver actives to a substrateInfo
- Publication number
- EP2841106A1 EP2841106A1 EP13713613.1A EP13713613A EP2841106A1 EP 2841106 A1 EP2841106 A1 EP 2841106A1 EP 13713613 A EP13713613 A EP 13713613A EP 2841106 A1 EP2841106 A1 EP 2841106A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- formulation
- silicone
- skin
- benchmark
- exs
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000000203 mixture Substances 0.000 title claims abstract description 407
- 229920001296 polysiloxane Polymers 0.000 title claims abstract description 85
- 239000000546 pharmaceutical excipient Substances 0.000 title claims abstract description 42
- 239000012049 topical pharmaceutical composition Substances 0.000 title description 27
- 239000000758 substrate Substances 0.000 title description 18
- 238000009472 formulation Methods 0.000 claims abstract description 327
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 27
- 239000002904 solvent Substances 0.000 claims abstract description 26
- 239000007787 solid Substances 0.000 claims abstract description 25
- 230000001225 therapeutic effect Effects 0.000 claims abstract description 17
- 239000003623 enhancer Substances 0.000 claims abstract description 15
- 230000000699 topical effect Effects 0.000 claims abstract description 6
- 238000012377 drug delivery Methods 0.000 claims abstract description 4
- -1 polyethylene Polymers 0.000 claims description 56
- 229920002379 silicone rubber Polymers 0.000 claims description 47
- 239000004480 active ingredient Substances 0.000 claims description 28
- DNIAPMSPPWPWGF-UHFFFAOYSA-N monopropylene glycol Natural products CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 20
- 229920002050 silicone resin Polymers 0.000 claims description 19
- 235000013870 dimethyl polysiloxane Nutrition 0.000 claims description 16
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 16
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 15
- 229920001971 elastomer Polymers 0.000 claims description 15
- 239000000806 elastomer Substances 0.000 claims description 15
- 229940008099 dimethicone Drugs 0.000 claims description 13
- 239000004264 Petrolatum Substances 0.000 claims description 11
- 229920006037 cross link polymer Polymers 0.000 claims description 11
- 235000019271 petrolatum Nutrition 0.000 claims description 11
- 229940066842 petrolatum Drugs 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical group CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 9
- 239000004820 Pressure-sensitive adhesive Substances 0.000 claims description 9
- GTJOHISYCKPIMT-UHFFFAOYSA-N 2-methylundecane Chemical compound CCCCCCCCCC(C)C GTJOHISYCKPIMT-UHFFFAOYSA-N 0.000 claims description 8
- SGVYKUFIHHTIFL-UHFFFAOYSA-N Isobutylhexyl Natural products CCCCCCCC(C)C SGVYKUFIHHTIFL-UHFFFAOYSA-N 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 8
- VKPSKYDESGTTFR-UHFFFAOYSA-N isododecane Natural products CC(C)(C)CC(C)CC(C)(C)C VKPSKYDESGTTFR-UHFFFAOYSA-N 0.000 claims description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 7
- 239000003755 preservative agent Substances 0.000 claims description 7
- XMSXQFUHVRWGNA-UHFFFAOYSA-N Decamethylcyclopentasiloxane Chemical compound C[Si]1(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O1 XMSXQFUHVRWGNA-UHFFFAOYSA-N 0.000 claims description 6
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 6
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- PUPZLCDOIYMWBV-UHFFFAOYSA-N (+/-)-1,3-Butanediol Chemical compound CC(O)CCO PUPZLCDOIYMWBV-UHFFFAOYSA-N 0.000 claims description 4
- KGKQNDQDVZQTAG-UHFFFAOYSA-N 8-methylnonyl 2,2-dimethylpropanoate Chemical compound CC(C)CCCCCCCOC(=O)C(C)(C)C KGKQNDQDVZQTAG-UHFFFAOYSA-N 0.000 claims description 4
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 4
- KAESVJOAVNADME-UHFFFAOYSA-N Pyrrole Chemical compound C=1C=CNC=1 KAESVJOAVNADME-UHFFFAOYSA-N 0.000 claims description 4
- SZXQTJUDPRGNJN-UHFFFAOYSA-N dipropylene glycol Chemical compound OCCCOCCCO SZXQTJUDPRGNJN-UHFFFAOYSA-N 0.000 claims description 4
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 claims description 3
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 claims description 3
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 claims description 3
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- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 claims description 3
- 239000000041 non-steroidal anti-inflammatory agent Substances 0.000 claims description 3
- 229940021182 non-steroidal anti-inflammatory drug Drugs 0.000 claims description 3
- 230000035515 penetration Effects 0.000 claims description 3
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims description 3
- 150000003431 steroids Chemical class 0.000 claims description 3
- SCRSFLUHMDMRFP-UHFFFAOYSA-N trimethyl-(methyl-octyl-trimethylsilyloxysilyl)oxysilane Chemical compound CCCCCCCC[Si](C)(O[Si](C)(C)C)O[Si](C)(C)C SCRSFLUHMDMRFP-UHFFFAOYSA-N 0.000 claims description 3
- ALSTYHKOOCGGFT-KTKRTIGZSA-N (9Z)-octadecen-1-ol Chemical compound CCCCCCCC\C=C/CCCCCCCCO ALSTYHKOOCGGFT-KTKRTIGZSA-N 0.000 claims description 2
- HIQIXEFWDLTDED-UHFFFAOYSA-N 4-hydroxy-1-piperidin-4-ylpyrrolidin-2-one Chemical compound O=C1CC(O)CN1C1CCNCC1 HIQIXEFWDLTDED-UHFFFAOYSA-N 0.000 claims description 2
- 239000005642 Oleic acid Substances 0.000 claims description 2
- 230000003255 anti-acne Effects 0.000 claims description 2
- 229940088710 antibiotic agent Drugs 0.000 claims description 2
- UQEAIHBTYFGYIE-UHFFFAOYSA-N hexamethyldisiloxane Chemical compound C[Si](C)(C)O[Si](C)(C)C UQEAIHBTYFGYIE-UHFFFAOYSA-N 0.000 claims description 2
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 claims description 2
- 229940055577 oleyl alcohol Drugs 0.000 claims description 2
- XMLQWXUVTXCDDL-UHFFFAOYSA-N oleyl alcohol Natural products CCCCCCC=CCCCCCCCCCCO XMLQWXUVTXCDDL-UHFFFAOYSA-N 0.000 claims description 2
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- 239000004945 silicone rubber Substances 0.000 claims description 2
- 229940126680 traditional chinese medicines Drugs 0.000 claims description 2
- MEJYDZQQVZJMPP-ULAWRXDQSA-N (3s,3ar,6r,6ar)-3,6-dimethoxy-2,3,3a,5,6,6a-hexahydrofuro[3,2-b]furan Chemical compound CO[C@H]1CO[C@@H]2[C@H](OC)CO[C@@H]21 MEJYDZQQVZJMPP-ULAWRXDQSA-N 0.000 claims 1
- 241000124008 Mammalia Species 0.000 claims 1
- 239000000839 emulsion Substances 0.000 claims 1
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- 239000012528 membrane Substances 0.000 description 35
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- HEFNNWSXXWATRW-UHFFFAOYSA-N Ibuprofen Chemical compound CC(C)CC1=CC=C(C(C)C(O)=O)C=C1 HEFNNWSXXWATRW-UHFFFAOYSA-N 0.000 description 31
- 229960001680 ibuprofen Drugs 0.000 description 31
- 238000002474 experimental method Methods 0.000 description 29
- 230000001186 cumulative effect Effects 0.000 description 28
- JYGXADMDTFJGBT-VWUMJDOOSA-N hydrocortisone Chemical compound O=C1CC[C@]2(C)[C@H]3[C@@H](O)C[C@](C)([C@@](CC4)(O)C(=O)CO)[C@@H]4[C@@H]3CCC2=C1 JYGXADMDTFJGBT-VWUMJDOOSA-N 0.000 description 26
- 239000001993 wax Substances 0.000 description 21
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- 101100275159 Arabidopsis thaliana COBL7 gene Proteins 0.000 description 14
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- 101150005224 SBH1 gene Proteins 0.000 description 14
- 101100256357 Schizosaccharomyces pombe (strain 972 / ATCC 24843) seb1 gene Proteins 0.000 description 14
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- 239000013543 active substance Substances 0.000 description 12
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- 101100440481 Arabidopsis thaliana COBL8 gene Proteins 0.000 description 11
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- 238000002360 preparation method Methods 0.000 description 11
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- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 8
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 8
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- CBGUOGMQLZIXBE-XGQKBEPLSA-N clobetasol propionate Chemical compound C1CC2=CC(=O)C=C[C@]2(C)[C@]2(F)[C@@H]1[C@@H]1C[C@H](C)[C@@](C(=O)CCl)(OC(=O)CC)[C@@]1(C)C[C@@H]2O CBGUOGMQLZIXBE-XGQKBEPLSA-N 0.000 description 8
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- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 7
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- 239000011550 stock solution Substances 0.000 description 7
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- DCOPUUMXTXDBNB-UHFFFAOYSA-N diclofenac Chemical compound OC(=O)CC1=CC=CC=C1NC1=C(Cl)C=CC=C1Cl DCOPUUMXTXDBNB-UHFFFAOYSA-N 0.000 description 6
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
- A61K47/44—Oils, fats or waxes according to two or more groups of A61K47/02-A61K47/42; Natural or modified natural oils, fats or waxes, e.g. castor oil, polyethoxylated castor oil, montan wax, lignite, shellac, rosin, beeswax or lanolin
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K9/00—Medicinal preparations characterised by special physical form
- A61K9/0012—Galenical forms characterised by the site of application
- A61K9/0014—Skin, i.e. galenical aspects of topical compositions
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P29/00—Non-central analgesic, antipyretic or antiinflammatory agents, e.g. antirheumatic agents; Non-steroidal antiinflammatory drugs [NSAID]
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P5/00—Drugs for disorders of the endocrine system
- A61P5/38—Drugs for disorders of the endocrine system of the suprarenal hormones
- A61P5/44—Glucocorticosteroids; Drugs increasing or potentiating the activity of glucocorticosteroids
Definitions
- the present disclosure relates to topical formulation compositions containing silicone-based excipients to deliver pharmaceutical, personal care or healthcare actives to a substrate, such as mammalian skin.
- Topically applied formulations avoid a variety of concerns associated with oral and intravenous application methods, including avoidance of first-pass metabolism, possible gastro-intestinal incompatibility and varied conditions of absorption, like pH changes, presence of enzymes, and gastric emptying times. Moreover, topically applied formulations may provide several additional advantages including lower fluctuations in plasma drug levels, ability to more selectively target a specific site for treatment, and ease of treatment. For some conditions, the most effective way to deliver an active is by applying such active directly to the source.
- Topical formulations that previously described in the prior art still possess several significant limitations such as poor permeability of the drug through the skin from the formulation, low efficiency in delivering the drug by the formulation, residual drugs in the formulation post-application, poor wear characteristics that decrease delivery efficacy and patience compliance, and poor aesthetics that also lead to poor patience compliance. Therefore, there is a need for a new class of topical formulations that improve and overcome the limitations discussed above.
- topical formulation that can deliver a therapeutic amount of an active ingredient to the skin for an extended period of time, such as for more than about four, eight or up to 24 hours. Additionally, there is currently a need for a topical formulation that is capable of being free or substantially free of preservatives. Moreover, the active ingredient has to be uniformly incorporated into the topical formulation; in other words, the active ingredient should not include any agglomerates. Finally, the topical formulation should maintain an aesthetic profile and pleasant sensory upon application.
- a controlled release semi-solid topical drug delivery formulation is disclosed.
- the controlled-release formulation is for topical application of an active ingredient to a substrate, such as mammalian skin.
- the topical formulation provides increased penetration (flux) into the skin of the active ingredient dissolved or dispersed in the formulation compared to the topical formulations currently available in the art.
- the formulation prepared according to the present disclosure may include a silicone-based excipient, at least one volatile solvent, at least one active configured to be topically delivered through a patient's skin for an intended therapeutic application, and at least one enhancer.
- the formulation may additionally optionally include at least one agent that is configured to provide occlusivity when the formulation is applied onto the patient's skin.
- the at least one active may be a pharmaceutical, personal care and/or a healthcare active.
- the silicone-based excipient may be a silicone elastomer blend, a silicone organic elastomer blend, a silicone resin, a silicone elastomer, a pressure sensitive adhesive, a silicone gum, or any combination thereof.
- the silicone-based excipient may be a silicone elastomer blend, or a silicone organic elastomer blend included in a silicone or organic carrier fluid such as isododecane, cyclopentasiloxane, isodecylneopentanoate, caprylyl methicone, isopropyl alcohol, propylene glycol, and any combination thereof.
- the silicone-based excipient may be a dimethicone cross polymer, a dimethicone/bis-isobutyl propylene glycol cross polymer, a polyethylene glycol-12 dimethicone/bis-isobutyl propylene glycol-20 cross polymer, or any combination thereof.
- the topical formulation according to the present disclosure may be anhydrous and may be free or substantially free of preservatives.
- the topical formulation may be configured to deliver a therapeutic amount of pharmaceutical or healthcare active to the substrate such as skin for an extended period of time.
- the topical formulation may be configured to deliver a therapeutic amount of pharmaceutical or healthcare active to a substrate, such as mammalian skin, for more than four, or, alternatively, for more than eight hours.
- FIG. 1 is a flux profile for silicone organic elastomer blend based formulation examples 1-3 including Ibuprofen and a commercial benchmark including Ibuprofen.
- FIG. 1 A is a flux profile for silicone elastomer blend based formulation example 3A and a commercial benchmark including ibuprofen.
- FIG. 2 is a flux profile for Petrolatum based formulation examples 4-6 including Ibuprofen and a commercial benchmark including Ibuprofen.
- FIG. 3 is a flux profile for Carbopol ® 971 P NF based formulation examples 7-9 including Ibuprofen and a commercial benchmark including Ibuprofen.
- FIG. 4 is a flux profile for Eudragit ® E100 based formulation examples 10-12 including Ibuprofen and a commercial benchmark including Ibuprofen.
- FIG. 5 is a flux profile for Eudragit ® S100 based formulation examples 13-15 including Ibuprofen and a commercial benchmark including Ibuprofen.
- FIG. 6 is a flux profile for Eudragit ® L100 based formulation examples 16-18 including Ibuprofen and a commercial benchmark including Ibuprofen.
- FIG. 7 is a flux profile for Eudragit ® L100-55 based formulation examples 19-21 including Ibuprofen and a commercial benchmark including Ibuprofen.
- FIG. 8 is a flux profile for silicone organic elastomer blend based formulation examples 22-26 including diclofenac sodium and a commercial benchmark including diclofenac sodium.
- FIG. 9 is a flux profile for silicone elastomer blend based formulation examples 27 and 28 including diclofenac sodium and a commercial benchmark including diclofenac sodium.
- FIG. 10 is a flux profile for silicone organic elastomer blend based formulation example 29, silicone elastomer based formulation example 30, carbopol based formulation 31 , all including clobetasol propionate and a commercial benchmark including clobetasol propionate.
- FIG. 1 1 is a cumulative release profile for silicone gum based formulation examples 32-34 including ibuprofen, silicone elastomer blend based formulation examples 2 and 3A including ibuprofen, and a commercial benchmark including ibuprofen.
- FIG. 12 is a cumulative release profile for silicone gum based formulation examples 35-37 including hydrocortisone, silicone elastomer blend based formulation examples 38 and 39 including hydrocortisone, and a commercial benchmark including hydrocortisone.
- FIG. 13 is a cumulative release profile for silicone elastomer blend based formulation examples 40-42 and a commercial benchmark including ibuprofen.
- ambient conditions refers to surrounding conditions under about one atmosphere of pressure, at about 50% relative humidity, and at about 25°C, unless otherwise specified.
- the substrate is typically a biological surface, human body tissue, and/or animal body tissue. More specific substrates include, but are not limited to, skin, hair, mucous membrane, teeth, nails, and eyes.
- the formulation prepared according to the present disclosure is typically applied for topical therapy, such as to treat damaged or diseased skin, and wound care, such as to treat cuts, burns, scars, and the like, with a dressing formed from, or including, the controlled-release topical formulation where the silicone-based excipient functions as a substantive cream or a liquid bandage that continuously delivers the active agent to the substrate.
- the present disclosure including films formed by the controlled-release formulations of the present disclosure, may also be applied in various transdermal, pharmaceutical, veterinary, and oral health care applications. It may be used as an in situ formed patch standing by itself, or it can be protected with a secondary film, dressing, or patch, or it can be part of a more complex construction such as a transdermal patch or wound dressing.
- the controlled-release formulation which is hereafter referred to as the composition or the formulation, includes the silicone-based excipient and the active agent.
- the active agent is uniformly incorporated into or dispersed in the topical formulation.
- the topical formulations may be spread, sprayed, or otherwise dispersed on to the substrate such as skin or other tissue.
- the topical formulation may be prepared by mixing (a) a silicone-based excipient, (b) at least one volatile solvent, (c) at least one pharmaceutical active configured to be topically delivered through a patient's skin for an intended therapeutic application, and (d) at least one enhancer.
- the topical formulation may also optionally include (e) at least one agent configured to provide occlusivity when the formulation is applied to the patient's skin.
- the silicone-based excipient may be contained in a suitable carrier fluid.
- the formulation according to the present disclosure may include between about 2 and about 80% by weight of the silicone-based excipient. Alternatively, the formulation may include between about 10 and about 50% by weight of the silicone-based excipient.
- the formulation according to the present disclosure may include between about 10 and about 80% by weight of the at least one volatile solvent. Alternatively, the formulation may include between about 20 and about 60% by weight of the at least one volatile solvent.
- the at least one volatile solvent may include one solvent or a mixture of solvents as selected by one of ordinary skill in the art.
- the amount of healthcare or pharmaceutical active present in the topical formulation may vary.
- the formulation may include between about 0.001 to 50% by weight of the active.
- the formulation may include between about 0.05 to about 25% by weight of the active.
- the formulation may include between about 0.05 to about 10% by weight of the active.
- the formulation according to the present disclosure may include between about 0 and about 80% by weight of the at least one enhancer. Alternatively, the formulation may include between about 0.5 and about 50% by weight of the at least one enhancer.
- the enhancer may include a non-volatile excipient and a skin penetration enhancer and the weight ratio of the non-volatile excipient to the penetration enhancer in the final formulation may be from about 100:1 to about 50:50.
- the formulation may include between about 0.5 to about 50% by weight of the penetration enhancer.
- the formulation may include between about 20 to about 40% by weight of the non-volatile excipient.
- the formulation according to the present disclosure may additionally include between about 0 and about 50%% by weight of the at least one agent configured to provide occlusivity.
- the formulation may include between about 0.5 to about 25% by weight of the agent configured to provide occlusivity.
- the silicone-based excipient may be any silicone-containing polymer material, including a silicone elastomer blend, a silicone organic elastomer blend, a silicone resin, a silicone elastomer, a pressure sensitive adhesive, a silicone gum, a silicone wax, an elastomer base sealant, adhesive or any combination thereof.
- the silicone-based excipient may be a dimethicone cross polymer, a dimethicone/bis-isobutyl propylene glycol cross polymer, a polyethylene glycol-12 dimethicone/bis-isobutyl propylene glycol-20 cross polymer, or any combination thereof.
- Silicones are a class of compounds based on polydialkylsiloxanes. Silicones have been used extensively to enhance aesthetics of personal care formulations by providing a unique sensory profile upon application. Silicone elastomer gels are generally obtained by a crosslinking hydrosilylation reaction of a SiH polysiloxane with another polysiloxane containing an unsaturated hydrocarbon substituent, such as a vinyl functional polysiloxane, or by crosslinking a SiH polysiloxane with a hydrocarbon diene. The silicone elastomers may be formed in the presence of a carrier fluid, such as a volatile silicone, resulting in a gelled formulation.
- a carrier fluid such as a volatile silicone
- the silicone-based excipient may be a pressure sensitive adhesive (PSA).
- PSA may be the reaction product of a hydroxyl end-blocked polydimethylsiloxane polymer and a hydroxy functional silicate resin. The polymer and resin react in a condensation reaction to form the PSA.
- the advantage of using the PSA as the silicone component is the substantivity that the PSA provides. The substantivity is particularly advantageous in human and veterinary applications that require significant substantivity for the active agent to provide sustained pharmacological effects.
- silicone rubber and “silicone elastomer” are synonymous, at least to the extent that both silicone components are capable of elongation and recovery.
- the silicone elastomers may be contained in a carrier fluid such as cyclopentasiloxane, isododecane, isodecylneopentanoate, caprylyl methicone, or other suitable carrier fluids.
- Silicone rubbers and silicone elastomers are generally crosslinked or reacted silicone polymers. In contrast, silicone gums are capable of being stretched, but they do not generally snap back.
- Silicone gums are the high molecular weight, generally linear, polydiorganosiloxanes that can be converted from their highly viscous plastic state into a predominately elastic state by crosslinking. Silicone gums are often used as one of the main components in the preparation of silicone rubbers and silicone elastomers.
- the silicone resins may include MQ resins.
- MQ as it relates to silicone resins is derived from the symbols M, D, T, and Q each of which represent a functionality of different types of structural units which may be present in silicone resins containing siloxane units joined by Si— O— Si bonds.
- Monofunctional (M) unit represents (CH 3 ) 3 Si0 1/2 .
- Difunctional (D) unit represents (CH 3 ) 2 Si0 2/2 - Trifunctional (T) unit represents CH 3 Si0 3/2 and results in the formation of branched linear siloxanes.
- Tetrafunctional (Q) unit represents Si0 4/2 which results in the formation of crosslinked and resinous silicone compositions.
- MQ is used when the siloxane contains all monofunctional M and tetrafunctional Q units, or at least a high percentage of M and Q units such as to render the silicone resinous.
- Silicone resins may include non-linear siloxane resins having a glass transition temperature (Tg) above about 0°C. Glass transition temperature is the temperature at which an amorphous material such as a higher silicone polymer changes from a brittle vitreous state to a plastic state.
- the silicone resin generally has the formula R' a SiO (4 - a)/2 wherein R' is a monovalent hydrocarbon group with 1-6 carbon atoms or a functionally substituted hydrocarbon group with 1-6 carbon atoms, and a has an average value of 1 -1 .8.
- the silicone resin will preferably include monofunctional (M) units R" 3 Si0 1/2 and tetrafunctional (Q) units Si0 4/2 , in which R" is the monovalent hydrocarbon group having 1 -6 carbon atoms, most preferably the methyl group.
- the number ratio of M groups to Q groups may be in the range of 0.5:1 to 1.2:1 , so as to provide an equivalent wherein a in the formula R' a SiO (4-a)/2 has an average value of 1.0-1.63.
- the number ratio of M groups to Q groups may also be between about 0.6:1 to about 0.9:1. Silicone MQ resins in which the number of Q units per molecule is higher than 1 or higher than 5 may also be used.
- the silicone resin may also contain between about 1 to about 5% by weight of silicon-bonded hydroxyl radicals such as a dimethylhydroxysiloxy unit (HO)(CH 3 ) 2 SiOi /2 . If desired, the silicone resin may contain minor amounts of difunctional (D) units and/or trifunctional (T) units. Silicone resins having a viscosity of at least 100,000,000 (100 million) centistoke (mmf 2 /s) and a softening temperature of less than about 200°C may also be used.
- silicon-bonded hydroxyl radicals such as a dimethylhydroxysiloxy unit (HO)(CH 3 ) 2 SiOi /2 .
- the silicone resin may contain minor amounts of difunctional (D) units and/or trifunctional (T) units. Silicone resins having a viscosity of at least 100,000,000 (100 million) centistoke (mmf 2 /s) and a softening temperature of less than about 200°C may also be used.
- the silicone resin may include (i) silicone resins of the type M x Q y where x and y have values such that the silicone resin contains at least more than 5 Q units per molecule; (ii) silicone resins of the type M x T y where x and y have values such that the silicone resin contains at least more than 5 T units per molecule; and (iii) silicone resins of the type M x D y T p Q q where x, y, p, and q have values such that the sum of Q and T units is at least more than 5 units per molecule, and the number of D units varies from 0-100.
- the formulation according to the present disclosure includes a volatile solvent.
- the silicone-based excipient may be contained in volatile solvent (or carrier fluid) to provide the present topical formulations.
- the volatile solvent is the solvent used for conducting the hydrosilylation reaction to form the silicone-based excipient.
- Suitable volatile solvents include volatile solvents, organic liquids (oils and solvents), silicones and mixtures thereof.
- Solvents may include volatile liquids such as alcohols (e.g., methyl, ethyl, isopropyl alcohols and methylene chloride); ketones (e.g., acetone); aromatic hydrocarbons such as benzene derivatives (e.g., xylenes and toluenes); lower molecular weight alkanes and cycloalkanes (e.g., hexanes, heptanes and cyclohexanes); and alkanoic acid esters (e.g., ethyl acetate, n-propyl acetate, isobutyl acetate, n-butyl acetate, isobutyl isobutyrate, hexyl acetate, 2-ethylhexyl acetate or butyl acetate); and combinations and mixtures thereof.
- alcohols e.g., methyl, ethyl, isopropyl alcohols and
- the volatile solvent is an organic liquid.
- Organic liquids include oils and solvents.
- the organic liquids are exemplified by, but not limited to, aromatic hydrocarbons, aliphatic hydrocarbons, alcohols, aldehydes, ketones, amines, esters, ethers, glycols, glycol ethers, alkyl halides and aromatic halides.
- Hydrocarbons include, isododecane, isohexadecane, Isopar L (C1 1 -C13), Isopar H (C1 1 -C12), hydrogentated polydecene.
- Ethers and esters include, isodecyl neopentanoate, neopentylglycol heptanoate, glycol distearate, dicaprylyl carbonate, diethylhexyl carbonate, propylene glycol n butyl ether, ethyl-3 ethoxypropionate, propylene glycol methyl ether acetate, tridecyl neopentanoate, propylene glycol methylether acetate (PGMEA), propylene glycol methylether (PGME).
- octyldodecyl neopentanoate diisobutyl adipate, diisopropyl adipate, propylene glycol dicaprylate/dicaprate, and octyl palmitate.
- Additional volatile solvents suitable as a standalone compound or as an ingredient to the carrier fluid include fats, oils, fatty acids, and fatty alcohols.
- the volatile solvent may also be a low viscosity organopolysiloxane or a volatile methyl siloxane or a volatile ethyl siloxane or a volatile methyl ethyl siloxane having a viscosity at 25°C in the range of about 1 to about 1 ,000 mm 2 /sec, exemplified by hexamethylcyclotrisiloxane, octamethyleyelotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, octamethyltrisiloxane, decamethyltetrasiloxane, dodecamethylpentasiloxane, tetradecamethylhe xasiloxane, hexadeamethylheptasiloxane, heptamethyl-3- ⁇ (trimethylsilyl)oxy) ⁇ trisiloxane, hexa
- excipients and/or enhancing agents may be incorporated into the topical formulation.
- excipients are additives that are used to convert the active agent into appropriate dosage forms that are suitable for application to the substrate. Excipients may also be added to stabilize the formulation and to optimize application characteristics, such as flowability.
- excipients include, but are not limited to, excipients that are found in the Cosmetics, Toiletry, Fragrance Association (CTFA) ingredient Database and the handbook of pharmaceutical excipients such as absorbents, anticaking agents, antioxidants (such as, ascorbic acid, ascorbic acid polypeptide, ascorbyl dipalmitate, BHA, BHT, magnesium ascorbate, magnesium ascorbyl phosphate, propyl gallate sodium ascorbate, sodium ascorbyl/cholesteryl phosphate, sodium bisulfite, sodium erythorbate, sodium metabisulfide, tocopheryl acetate, tocopheryl nicotinate), antistatic agents, astringents, binders, buffering agents, bulking agents, chelating agents, colorants, cosmetic astringents, biocides (such as parabens, organic acids, organic bases, alcohols, isothiazolinones and others), deodorant agents, emollient
- CTFA Cosmetics
- excipients include, but are not limited to, sugars and derivatives (such as acacia, dextrin, dextrose, maltodextrin, and sorbitol), starch derivatives, cellulosic materials (such as methyl cellulose, Ethylcellulose, Hydroxyethylcellulose, Hydroxypropylcellulose, and Hydroxypropylmethylcellulose,), polysaccharides (such as dextrates, guar gum, and xanthan gum), polyethers, suspending agents cyclodextrins, and others
- Enhancers may also be exemplified by monohydric alcohols such as ethanol and isopropyl, butyl and benzyl alcohols, or dihydric alcohols such as ethylene glycol, diethylene glycol, or propylene glycol, dipropylene glycol and trimethylene glycol, or polyhydric alcohols such as butylene glycol, hexylene glycol, polypropylene glycol, ethylene glycol, and polyethylene glycol, which enhance drug solubility; polyethylene glycol ethers of aliphatic alcohols (such as cetyl, lauryl, oleyl and stearyl) including polyoxyethylene (4) lauryl ether, polyoxyethylene (2) oleyl ether and polyoxyethylene (10) oleyl ether commercially available under the trademark BRIJ® 30, 93 and 97, respectively, from Uniqema Americas LLC (Wilmington, DE), and others such as BRIJ® 35, 52, 56, 58, 72, 76, 78
- Polyhydric alcohols also include glycols, triols and polyols having 4 to 6 alcoholic hydroxyl groups.
- Typical of said glycols are glycols containing 2 to 6 carbon atoms, e.g. ethylene glycol, propylene glycol, butylene glycol, polyethylene glycol (average molecular weight about 200-8,000, preferably about 200 to 6,000), etc.
- Examples of said triols include glycerin, trimethylolpropane, etc.
- Said polyols are exemplified by sorbitol, polyvinylpyrrolidone, etc.
- These polyhydric alcohols may be used either singularly or in combination (preferably, of two or three).
- glycerin or dipropylene glycol alone, or a mixture of either glycerin or dipropylene glycol with butylene glycol can be employed.
- the formulation may include an active selected from any personal, healthcare, or pharmaceutical active.
- a personal care active means any compound or mixtures of compounds that are known in the art as additives in the personal care formulations that are typically added for treating hair or skin to provide a cosmetic and/or aesthetic benefit.
- a “healthcare active” means any compound or mixtures of compounds that are known in the art to provide a pharmaceutical or medical benefit.
- “healthcare active” includes materials considered as an active ingredient or active drug ingredient as generally used and defined by the United States Department of Health & Human Services Food and Drug Administration, contained in Title 21 , Chapter I, of the Code of Federal Regulations, Parts 200-299 and Parts 300-499.
- active ingredient can include any component that is intended to furnish pharmacological activity or other direct effect in the diagnosis, cure, mitigation, treatment, or prevention of disease, or to affect the structure or any function of the body of a human or other animals.
- the phrase can include those components that may undergo chemical change in the manufacture of drug products and be present in drug products in a modified form intended to furnish the specified activity or effect.
- Some representative examples of pharmaceutical or healthcare active ingredients include non-steroidal anti-inflammatory drug, a steroid, a retinoid, an azole, traditional Chinese medicines, anti-acne, antibiotics, or any combination thereof.
- the active ingredient can include a water-soluble or an oil-soluble active drug ingredient.
- suitable water-soluble active drug ingredients which can be used are hydrocortisone, ketoprofen, morphine, hydromorphone, heparin, penicillin G, 5-fluorouracil, 6-azauridine, 6-thioguanine, niacinamide, salicylic acid, and ketoconazole.
- oil-soluble active drug ingredients are clonidine, scopolamine, nitroglycerin, ibuprofen, indomethacin, naproxen, and steroids.
- Active ingredients for purposes of the present invention also include anti-acne agents such as benzoyl peroxide and tretinoin; anti-inflammatory agents; corticosteroidal drugs; non-steroidal anti-inflammatory agents such as diclofenac; anesthetic agents such as lidocaine; antipruritic agents; and antidermatitis agents.
- anti-acne agents such as benzoyl peroxide and tretinoin
- anti-inflammatory agents such as benzoyl peroxide and tretinoin
- corticosteroidal drugs such as diclofenac
- anesthetic agents such as lidocaine
- antipruritic agents antipruritic agents
- antidermatitis agents such as lidocaine
- active ingredients include minerals; hormones; topical antimicrobial and antibacterial agents such as chlorohexadiene gluconate agents and antibiotic active ingredients, antifungal active ingredients, such as miconazole nitrate,; astringent active ingredients; deodorant active ingredients; wart remover active ingredients; corn and callus remover active ingredients; pediculicide active ingredients for the treatment of head, pubic (crab), and body lice; active ingredients for the control of dandruff, seborrheic dermatitis, or psoriasis, such as clobetasol propionate; and sunburn prevention and treatment agents.
- topical antimicrobial and antibacterial agents such as chlorohexadiene gluconate agents and antibiotic active ingredients, antifungal active ingredients, such as miconazole nitrate,
- astringent active ingredients deodorant active ingredients
- wart remover active ingredients wart remover active ingredients
- corn and callus remover active ingredients corn and callus remover active ingredients
- the active agent may include a lipophilic drug and/or hydrophilic drug.
- Useful active ingredients for use in formulations according to the present disclosure include vitamins and its derivatives, including "pro-vitamins.”
- Vitamins useful herein include, but are not limited to, Vitamin A-i, retinol, C 2 -Ci 8 esters of retinol, vitamin E, tocopherol, esters of vitamin E, and mixtures thereof.
- Retinol includes trans-retinol, 1 ,3-cis-retinol, 1 1 -cis-retinol, 9-cis-retinol, and 3,4-didehydro-retinol, Vitamin C and its derivatives, Vitamin B-i, Vitamin B 2 , Pro Vitamin B 5 , panthenol, Vitamin B 6 , Vitamin B 12 , niacin, folic acid, biotin, and pantothenic acid.
- vitamins and the INCI names for the vitamins considered included herein are ascorbyl dipalmitate, ascorbyl methylsilanol pectinate, ascorbyl palmitate, ascorbyl stearate, ascorbyl glucocide, sodium ascorbyl phosphate, sodium ascorbate, disodium ascorbyl sulfate, potassium (ascorbyl/tocopheryl) phosphate.
- the active component of the present invention can be a protein, such as an enzyme.
- the internal inclusion of enzymes in these formulations has the advantages of preventing enzymes from deactivating and maintaining bioactive effects of enzymes for a longer time period.
- Enzymes include, but are not limited to, commercially available types, improved types, recombinant types, wild types, variants not found in nature, and mixtures thereof.
- suitable enzymes include hydrolases, cutinases, oxidases, esterases, lactases, peroxidases, and mixtures thereof.
- Hydrolases include, but are not limited to, proteases (bacterial, fungal, acid, neutral or alkaline), amylases (alpha or beta), lipases, cellulases, collagenases, lisozyrnes, and mixtures thereof.
- Said protease include, but are not limited to, trypsin, chymotrypsin, pepsin, pancreatin and other mammalian enzymes; papain, bromelain and other botanical enzymes; subtilisin, epidermin, nisin, naringinase(L-rhammnosidase) urokinase and other bacterial enzymes.
- Said lipase include, but are not limited to, triacyl-glycerol lipases, monoacyl-glycerol lipases, lipoprotein lipases, e.g. steapsin, erepsin, pepsin, other mammalian, botanical, bacterial lipases and purified ones. Natural papain is included as said enzyme. Further, stimulating hormones, e.g. insulin, can be used together with these enzymes to boost their effectiveness.
- the pharmaceutical or healthcare active may also include one or more plant extracts.
- plant extracts examples of these components are as follows: t, Ginkgo Biloba extract, , oolong tea extract, Echinacea extract, Scutellaria root extract, Phellodendro bark extract, Watercress extract, Chamomile extract, Horsetail extract, lemon extract, Chinese milk vetch extract, rose extract, rosemary extract, Roman Chamomile extract royal jelly extract or any other botanical extract that may be topically applied to achieve a pharmaceutical outcome.
- the active ingredient may be selected depending on the application for which the topical formulation is used. For example, if the desired effect is pain relief, ibuprofen may be used as the active. If the desired effect is acne prevention and control, benzoyl peroxide may be used.
- the formulation may include an occlusivity agent configured to provide occlusivity when the formulation is applied on top of the skin.
- the occlusivity agent may include petrolatum, organic wax, silicone wax, polyacrylates and methacrylates (exemplified by, but not limited to Eudragit® E100, S100, L100, and L100-55), polyvinyl pyrolidone, polyvinyl alcohol, vinylacetate-vinylpyrolidone copolymer, or any combination thereof.
- a majority of film-forming polymers can be considered to provide occlusive properties to the formulation and thus any suitable film-forming polymer may be used in the present formulation.
- the occlusivity agent may be a wax or a wax-like material.
- the waxes or wax-like materials useful in the formulation according to the present disclosure generally have a melting point range of about 35 to 120°C at atmospheric pressure.
- Waxes in this category include synthetic wax, ceresin, paraffin, ozokerite, beeswax, carnauba, microcrystalline, lanolin, lanolin derivatives, candelilla, cocoa butter, shellac wax, spermaceti, bran wax, capok wax, sugar cane wax, montan wax, whale wax, bayberry wax, or mixtures thereof.
- the occlusivity agent may include waxes capable of being used as non-silicone fatty substances, animal waxes, such as beeswax; vegetable waxes, such as carnauba, candelilla wax; mineral waxes, such as paraffin or lignite wax; microcrystalline waxes; ozokerites; synthetic waxes, including polyethylene waxes, and waxes obtained by the Fischer-Tropsch synthesis. Additionally, the occlusivity agent may include silicone waxes, polymethylsiloxane alkyls, alkoxys and/or esters.
- the formulation may also contain a number of optional ingredients.
- these optional components are selected from those known in the art to be ingredients used in personal care or pharmaceutical formulations.
- Illustrative, non-limiting examples include surfactants, solvents, powders, coloring agents, thickeners, waxes, gelling agents or clays, stabilizing agents, pH regulators, silicones, or other suitable agents.
- Thickening agent may be added to provide a desired or convenient viscosity. For example, viscosities within the range of 500 to 25,000 mm 2 /s at 25°C. Alternatively, thickening agents may be added to obtain viscosities within the range of about 3,000 to about 7,000 mm 2 /s.
- Suitable thickening agents are exemplified by sodium alginate, gum arable, polyoxyethylene, guar gum, hydroxypropyl guar gum, ethoxylated alcohols, such as laureth-4 or polyethylene glycol 400, cellulose derivatives exemplified by methylcellulose, methylhydroxypropylcellulose, hydroxypropylcellulose, polypropylhydroxyethylcellulose, starch, and starch derivatives exemplified by hydroxyethylamylose and starch amylose, locust bean gum, electrolytes exemplified by sodium chloride and ammonium chloride, and saccharides such as fructose and glucose, and derivatives of saccharides such as PEG-120 methyl glucose diolate or mixtures of 2 or more of these.
- the thickening agent is selected from cellulose derivatives, saccharide derivatives, and electrolytes, or from a combination of two or more of the above thickening agents exemplified by a combination of a cellulose derivative and any electrolyte, and a starch derivative and any electrolyte.
- the thickening agent may be present in an amount from about 0.05 to about 10% by weight, or, alternatively about 0.05 to about 5% by weight based on the total weight of the formulation.
- Suitable cosmetic, personal care, and cosmetic components include, but are not limited to, alcohols, fatty alcohols and polyols, aldehydes, alkanolamines, alkoxylated alcohols butylene copolymers, carbohydrates (e.g. polysaccharides, chitosan and derivatives), carboxylic acids, carbomers, esters, ethers and polymeric ethers (e.g. PEG derivatives, PPG derivatives), glyceryl esters and derivatives, halogen compounds, heterocyclic compounds including salts, hydrophilic colloids and derivatives including salts and gums (e.g.
- cellulose derivatives cellulose derivatives, gelatin, xanthan gum, natural gums), imidazolines, inorganic materials (clay, Ti0 2 , ZnO), ketones (e.g. camphor), isethionates, lanolin and derivatives, organic salts, phenols including salts phosphorus compounds (e.g. phosphate derivatives), polyacrylates and acrylate copolymers, synthetic polymers including salts, siloxanes and silanes, sorbitan derivatives, sterols, sulfonic acids and derivatives and waxes.
- inorganic materials clay, Ti0 2 , ZnO
- ketones e.g. camphor
- isethionates e.g. camphor
- lanolin and derivatives organic salts
- phenols including salts phosphorus compounds e.g. phosphate derivatives
- polyacrylates and acrylate copolymers synthetic polymers including salts, siloxanes and silanes, sorb
- Other additives can include powders and pigments.
- the powder component that may be included can be generally defined as dry, particulate matter having an average particle size of about 0.02-50 microns.
- the particulate matter may be colored or non-colored (for example, white).
- Suitable powders include, but are not limited to, bismuth oxychloride, titanated mica, fumed silica, spherical silica beads, polymethylmethacrylate beads.
- the above mentioned powders may be surface treated to render the particles hydrophobic in nature.
- the powder component also may also include various organic and inorganic pigments.
- the organic pigments are generally various aromatic types including azo, indigoid, triphenylmethane, anthraquinone, and xanthine dyes.
- Inorganic pigments generally consist of insoluble metallic salts of certified color additives, referred to as the Lakes or iron oxides.
- a pulverulent coloring agent such as carbon black, and titanium dioxide, pearlescent agents, generally used as a mixture with colored pigments, or some organic dyes, generally used as a mixture with colored pigments and commonly used in the cosmetics industry, can be added to the formulation. In general, these coloring agents can be present in an amount by weight from about 0 to 20% with respect to the weight of the final formulation.
- Pulverulent inorganic or organic fillers can also be added, generally in an amount by weight from about 0 to about 40% with respect to the weight of the final formulation.
- These pulverulent fillers can be chosen from talc, micas, kaolin, zinc or titanium oxides, calcium or magnesium carbonates, silica, spherical titanium dioxide, glass or ceramic beads, metal soaps derived from carboxylic acids having 8-22 carbon atoms, non-expanded synthetic polymer powders, expanded powders and powders from natural organic compounds, such as cereal starches, which may or may not be crosslinked, copolymer microspheres, polytrap, and silicone resin microbeads.
- Optional components included in the present formulation may also include other silicones (including any already described above), organofunctional siloxanes, alkylmethylsiloxanes, siloxane resins and silicone gums.
- the topical formulations according to the present disclosure may be in the form of a cream, a gel, a powder, a paste, or a freely pourable liquid.
- such formulations can generally be prepared at room temperature if no solid materials at room temperature are presents in the formulations, using simple propeller mixers, Brookfield counter-rotating mixers, or homogenizing mixers. No special equipment or processing conditions are typically required. Depending on the type of form made, the method of preparation will be different, but such methods are well known by those of ordinary skill in the art.
- formulations are prepared without water, an anhydrous formulation results.
- Such formulations that do not include water may be prepared without the addition of any preservatives.
- the formulation is applied to the skin to deliver the active agent to the skin.
- the skin may be healthy and intact, or it may be damaged or wounded.
- the formulation may be applied, i.e., rubbed or coated, directly onto the skin.
- the formulation may be deposited on a transdermal patch prior to application of the formulation to the substrate, i.e., to the skin
- the controlled-release formulation according to the present disclosure is capable of delivering performance properties such as controlled tack, controlled lubrication, water resistance, and barrier properties.
- This controlled-release formulation has substantivity to the skin and other substrates, such as teeth.
- the significant substantivity of the formulation is particularly advantageous when a controlled rate of delivery of the active agent is required over an extended period of time.
- the controlled-release formulation is topically applied to the substrate where the film remains over the extended period of time, which may be four hours or longer, or eight hours or longer.
- the substantivity is important due to the presence of certain body oils and especially upon application to skin covered with hair.
- the formulation also has substantivity to wet substrates such as gums, teeth and mucosal membrane.
- the formulations according to the present disclosure can be used by standard and well-known methods, such as applying them to the human body, e.g. skin, hair, or teeth, using applicators, brushes, applying by hand, pouring them and/or possibly rubbing or massaging the formulation onto or into the body. Removal methods are also well known standard methods, including washing, wiping, peeling and the like. According to some embodiments, no removal of the formulation is required as the formulation is fully absorbed into the skin, such that no residue remains on the skin.
- An effective amount of the formulation for the particular purpose is applied to the skin. Such effective or therapeutic amounts generally range from about 1 mg/cm 2 to about 10mg/cm 2 .
- Application to the skin typically includes working the formulation into the skin. This method for applying to the skin comprises the steps of contacting the skin with the formulation in an effective amount and then rubbing the formulation onto the skin. These steps can be repeated as many times as desired to achieve the desired benefit.
- Carbopol ® 971 P IMF is a polyacrylic acid (Lubrizol Advanced Materials, Lubrizol Corporation (Cleveland, OH)).
- CLP is clobetasol propionate, USP grade (Spectrum Chemical Mfg. Corp. (New Brunswick, NJ)).
- Clobetasol propionate 0.05% USP ointment is a topical ointment containing 0.05% clobetasol propionate (E. Fougera & Co., a division of Nycomed U.S. Inc. (Melville, NY)).
- Cosmetic Wax is a cosmetic wax including stearyl dimethicone (and) octadecene (Dow Corning Corporation (Midland, Ml)).
- DCF diclofenac sodium, USP grade (Spectrum Chemical Mfg. Corp. (New Brunswick, NJ)).
- Eudragit ® E100 is poly(butyl methacrylate-co-(2-dimethylaminoethyl) methacrylate-co-methyl methacrylate) 1 :2:1 (Evonik Industries (Parsippany, NJ)).
- “Eudragit ® S100” is a poly(methacrylic acid-co-methyl methacrylate) 1 :2, (Evonik Industries (Parsippany, NJ)).
- “Eudragit ® L100” is a poly(methacrylic acid-co-methyl methacrylate) 1 :1 (Evonik Industries (Parsippany, NJ)).
- "Eudragit ® L100-55" is a poly(methacrylic acid-co-ethyl acrylate) 1 :1 (Evonik Industries (Parsippany, NJ)).
- “HCO” is hydrocortisone, USP grade (Sigma-Aldrich Co. (St. Louis, MO).
- HMDS hexamethyldisiloxane
- “Hydrocortisone 0.5% cream” is a topical cream containing 0.5% hydrocortisone (Walgreen Co. (Deerfield, IL)).
- "IBP” is ibuprofen, USP grade (Spectrum Mfg. Corp. (New Brunswick, NJ)).
- "Ibutop 5%” is a topical gel containing 5% Ibuprofen (Dolorgiet GmbH & Co. KG (Bonn, Germany)).
- ⁇ is isopropyl alcohol, HPLC grade (Fisher Scientific (Fair Lawn, NJ))
- OAC oleic acid, NF/FCC grade (Fisher Scientific (Fair Lawn, NJ)).
- Petrolatum is from Spectrum Chemicals Mfg. Corp. (New Brunswick, NJ).
- PG is propylene glycol, USP/FCC grade (Fisher Scientific (Fair Lawn, NJ)).
- SEB1 is a silicone organic elastomer blend of isododecane and dimethicone/bis-isobutyl propylene glycol 20 cross polymer with 15% solids (Dow Corning Corporation (Midland, Ml)).
- SEB2 is a silicone elastomer blend of cyclopentasiloxane and dimethicone cross polymer with 12.4% solids (Dow Corning Corporation (Midland, Ml)).
- SGM is a silicone gum containing hydroxyl-terminated dimethyl siloxane (Dow Corning Corporation (Midland, Ml)).
- Voltaren® Gel is a topical gel containing 1 % diclofenac sodium (Novartis Consumer Health Inc. (Parsippany, NJ)).
- Formulation Ex. 1 was prepared by weighing 0.1590g of IBP in a speed mixer cup followed by the addition of 0.3158 g of PG, 0.0351 g of OLAC, and 0.6514 g of I PA.
- the speed mixer cup was closed with a lid and was gently hand-rotated (shaken) until the IBP was completely dissolved.
- 2.0054 g of the silicone elastomer blend SEB1 (with 26.2% solids content) was weighed into the speed mixer cup, the speed mixer cup was closed with lid and the contents were mixed in the speed mixer until a uniform, homogeneous material was obtained.
- the formulation material was mixed using a spatula in between the speed mixer mixing cycles to achieve the homogeneous formulation.
- the SEB1 silicone elastomer blend contains silicone elastomer material blended with isododecane with a solid content of about 15%. Prior to the preparation of the formulation, the SEB1 silicone elastomer blend was concentrated to obtain the 26.2% solids content by evaporating the isododecane from the SEB1 silicone elastomer blend by keeping the material in the oven at 100°C. Gravimetric determination was carried out during the evaporation process to reach the 26.2% solid content.
- Formulation Exs. 2 and 3 were prepared using the 26.2% solids elastomer blend following a similar procedure to that described above by changing the amount of individual components as shown below in Table 1.
- Formulation 3A was prepared by following the above procedure using the SEB2 silicone elastomer blend (with 26% solids content). Prior to the preparation of the formulation, the SEB2 silicone elastomer blend was concentrated to get the 26% solids content similar to that carried out for SEB1 silicone elastomer blend as described above. The composition of formulation Ex. 3A is shown in Table 1 below.
- Silicone organic elastomer material (from SEB1 ) 16.6 15.0 15.8 -
- Silicone elastomer material (from SEB2) - - - 18.5
- the permeability behavior, the flux, or the amount of ibuprofen delivered through skin per unit area per unit time, ⁇ g/cm 2 /hr) from the above formulations was determined using Franz cell permeability experiment set-up at 32°C and using the epidermal layer of human cadaver skin.
- the Franz cell set-up initially the bottom compartment of a cell was placed in the unit and filled with 3 mL of phosphate buffered saline (PBS, pH 7.4). A small magnetic stir bar was added to the cell.
- the permeation area in the Franz cell was 0.63 cm 2 .
- the thawed epidermal layer of skin membrane (as a circle, 1.5875 cm diameter, 1.98 cm 2 area) was then carefully transferred to the top of the bottom compartment.
- 3 cells triplicate
- About 20 mg of the formulation was taken using positive displacement pipette, applied on the skin and spread manually to achieve a visibly homogeneous distribution.
- the top compartment (cap) of the Franz cell was attached to the top of the skin and both the top and bottom compartments were clamped together. PBS was added to an appropriate volume of the cell, about 5 mL, and then the permeability experiment was started. The experiment was carried out for 8 hours.
- FIG. 1 shows the flux profile for the Ibutop 5% benchmark, applied in the same amount, 20 mg, to the same amount (area) of the skin membrane. The flux experiment was carried out at the same time using the same conditions for all the formulations and for the benchmark.
- the flux profile for formulation Ex. 3A and the Ibutop 5% benchmark is shown in FIG. 1A.
- the commercially available benchmark product containing 5% by weight of Ibuprofen delivers less than about 8 ⁇ g/cm 2 /hr to the skin membrane after 2 hours and less than about 5 ⁇ g/cm 2 /hr to the skin membrane after 4 hours.
- the benchmark delivers a cumulative amount of between about 13 and 23.5 ⁇ g after 8 hours, which represents only between about 1.33% and 2.35% by weight of the drug that is present in the benchmark.
- the benchmark exhibited a maximum flux at about 13 ⁇ g/cm 2 /hr about 1 hour after application to the membrane.
- a burst effect is generally characterized by an increase in the flux value over a short period of time and hence the release shown by the benchmark may be considered as a burst effect.
- the benchmark delivered a very small amount of the drug which may provide negligible therapeutic effect.
- the 5% Ibuprofen formulation prepared in Ex. 2 has the highest flux profile out of Exs. 1 , 2, and 3.
- the flux of all the formulations prepared in Exs. 1 , 2, and 3 is significantly higher than that of the Ibutop 5% benchmark.
- the formulations exhibited a significant burst effect.
- the formulation prepared in Ex. 2 had the strongest burst effect, with a flux being over 50 ⁇ g/cm 2 /hr after 1 hour.
- the formulation prepared in Ex. 2 had a flux of slightly below 50 ⁇ g/cm 2 /hr 2-4 hours after application, a flux of about 35 ⁇ g/cm 2 /hr 6 hours after application, and a flux of about 25 ⁇ g/cm 2 /hr 8 hours after application.
- Table 5 the application of the formulation prepared in Ex. 2 to the skin resulted in about 180 ⁇ g of IBP being delivered to the skin after 8 hours, which is about 8 times higher than the benchmark.
- about 18% of the drug present in the formulation prepared in Ex. 2 was delivered to the skin after 8 hours, which is also about 8 times higher than the benchmark.
- the formulation prepared in Ex. 1 had a flux of about 30 ⁇ g/cm 2 /hr 2-4 hours after application, a flux of about 25 ⁇ g/cm 2 /hr 6 hours after application, and a flux of about 20 ⁇ g/cm 2 /hr 8 hours after application.
- Table 5 the application of the formulation prepared in Ex. 1 to the skin resulted in about 124 ⁇ g of IBP being delivered to the skin after 8 hours, which is about 5 times higher than the benchmark.
- about 12% of the drug present in the formulation prepared in Ex. 1 was delivered to the skin after 8 hours, which is also about 5 times higher than the benchmark.
- the formulation prepared in Ex. 3 had a flux of about 35 ⁇ g/cm 2 /hr 2-6 hours after application and a flux of about 30 ⁇ g/cm 2 /hr 8 hours after application.
- the formulations prepared in Exs. 1-3 can provide a therapeutic effect, generally, pain relief for ibuprofen, for at least eight hours or more. Additionally, due to the significantly higher flux of the formulations prepared in Exs. 1-3 as opposed to the benchmark, a significantly lower amount of active ingredient needs to be used to achieve a therapeutic effect provided by 5% drug in benchmark, which will be further shown in by Exs. 40-42 below. As seen in Table 5 below, the application of the formulation prepared in Ex.
- the formulation prepared in Ex. 3A had a flux of about 22 ⁇ g/cm 2 /hr after 1 hour. After 2-4 hours, the flux was about 30 ⁇ g/cm 2 /hr. After 6 hours, the flux increased to about 35 ⁇ g/cm 2 /hr. Finally, after 8 hours, the flux was the highest out of all the measurements, with a value of about 50 ⁇ g/cm 2 /hr. Therefore, formulation prepared in Ex. 3A is particularly well-suited for applications that require extended release of higher amount of active ingredient into the skin. The formulation prepared in Ex. 3A exhibited a burst effect about 1 hour after application and had sustained release up to 8 hours following application.
- the silicone elastomer blend containing formulations prepared in Exs. 1 -3A exhibited a significantly better flux profile than the Ibutop benchmark.
- the application of the formulations prepared in Exs. 1-3A to the skin resulted in significantly larger amounts of the drug actually being delivered to the skin after a period of time.
- the application of the Ibutop benchmark to Donor 1 's tissue of Donor 1 resulted in only about 2.35% by weight of the drug actually being delivered to the skin and the application of the Ibutop benchmark to Donor 2's tissue resulted in only about 1.62% by weight of the drug actually being delivered to the skin after 8 hours.
- the application of the formulations prepared according to Exs. 1-3A resulted in about 5-12 times more drug actually being delivered to the skin than the benchmark.
- the formulations prepared in Exs. 1-3A result in a much more economical and efficient product since a significantly higher percentage of the drug actually gets delivered to the skin.
- Formulation Exs. 4-21 were prepared using commonly used non-silicone based excipients in topical formulations, petrolatum, Carbopol® and acrylic polymers, in place of silicone excipients used in Exs. 1-3A above.
- Other excipients, PG, OLAC, I PA, were used as in formulation Exs. 1 -3A to achieve similar formulations.
- the flux profile of the resulting formulations (4-21 ) was tested and compared for efficiency of delivering IBP through the skin with the silicone formulation Exs. 1-3A.
- Silicone formulation Exs. 1-3A delivered a higher amount of the drug at 1 hr than the benchmark and than formulation Exs. 4-21.
- the silicone formulation Exs. 1-3A also released a higher amount of the drug after 8 hours.
- Formulation Ex. 4 was prepared by weighing 3.0050 g of petrolatum in a speed mixer cup followed by the addition of 0.5413 g of PG, 0.0601 g of OLAC and mixed in the speed mixer for homogeneity. 0.1897g of ibuprofen was then weighed, added to the speed mixer and mixed again until the drug completely dissolved.
- an appropriate amount of I PA was also added (see Table 2) after adding IBP. The formulation was mixed using a spatula in between the speed mixer mixing cycles to achieve a homogeneous formulation.
- FIG. 3 shows the flux profile for formulation Exs. 4, 5, and 6 along with the flux profile for commercially available benchmark product (Ibutop 5% gel).
- the flux experiment was carried out at the same time using the same conditions for all the formulations and the bench mark. About 20 mg of the formulations prepared in Exs. 4-6 was applied to the epidermis of Donor 3.
- the petrolatum based formulations prepared in Exs. 4-6 did not exhibit a burst effect. After 1 hour, those formulations had a flux profile of about 8 ⁇ g/cm 2 /hr. The flux increased to about 15 ⁇ g/cm 2 /hr 2 hours after application and remained at that value until the end of the experiment, which occurred 8 hours after the application.
- the petrolatum based formulations had a higher flux than the benchmark but a significantly lower flux than the formulations prepared in Exs. 1 -3A. As seen in Table 5, after 8 hours, the cumulative release to the skin from the formulations prepared in Exs.
- silicone based formulation Exs. 1-3A showed a cumulative release of about 124-196 ⁇ g in the same time period.
- the amount delivered at 1 hr by petrolatum based formulations was lower than that of the benchmark and the silicone based formulations.
- Formulation Ex. 7 was prepared by weighing 0.2017 g of Carbopol® 971 P NF in a scintillation vial followed by the addition of 3.5040 g of I PA. The mixture was mixed in a vortex mixer followed by the addition of 1 .5078 g of water. After the addition of water, it was mixed again in the vortex mixer. To the vial, 0.0941 g of PG, 0.0105 g of OLAC and 0.2796 g of IBP were added and mixed using the vortex mixer to obtain a homogeneous clear formulation in which the ibuprofen was completely dissolved. Similar procedure was followed to prepare the formulation Exs. 8 and 9 by changing the amount of individual components as shown in Table 3 below.
- FIG. 3 shows the flux profile for formulation Exs. 7, 8, and 9 along with that for the benchmark (Ibutop 5% gel). The flux experiment was carried out at the same time using the same conditions for all the formulations and the benchmark. About 20 mg of the formulation prepared in Exs. 7-9 was applied to the epidermis of Donor 4.
- the Carbopol® 971 P NF based formulations prepared in Exs. 7-9 exhibit a slightly better flux profile than the benchmark. Unlike the benchmark, these formulations exhibit an initial burst effect and provide about 17-20 ⁇ g/cm 2 /hr flux 1 hour after application. However, during the time period falling between about 2-8 hours after application, these formulations exhibit a flux profile of about 9-15 ⁇ g/cm 2 /hr, with the formulation prepared in Ex. 7 exhibiting the lowest flux profile and the formulation prepared in Ex. 8 exhibiting the highest flux profile. The formulation prepared in Ex. 9 had the steadiest flux profile, with the flux remaining at about 15 ⁇ g/cm 2 /hr between 1 -8 hours after application.
- the Carbopol® 971 P NF based formulations resulted in between about 39 and 62 ⁇ g, or about 3.9 and 6.2% by weight of the drug being delivered to the skin after 8 hours whereas silicone based formulation Exs. 1-3A showed a cumulative release of about 124-196 ⁇ g in the same time period.
- the amount delivered at 1 hr by Carbopol® based formulations was lower than that of the silicone based formulations prepared in Exs. 1 -3A.
- compositions of all the formulations, 10-21 are shown below in Table 4. Table 4. Composition of Formulation Examples 10-21 .
- FIGs. 4-7 show the flux profile for formulation Exs. 10-21 along with that for the benchmark (Ibutop 5% gel). The flux experiment was carried out at the same time using the same conditions for all the formulations and the bench mark. About 20 mg of the formulations prepared in Exs. 10-21 was applied to the membrane.
- the flux profile of the Eudragit® E100 based formulations prepared in Exs. 10-12 is actually worse than that for the benchmark.
- the Eudragit® E100 based formulations allow very little, if any, flux through the skin.
- the Eudragit® E100 based formulations resulted in between about 2 and 2.5 ⁇ g, or about 0.2 and 0.25% by weight of the drug being delivered to the skin after 8 hours.
- the silicone based formulations prepared in Exs. 1-3A resulted in cumulative release of about 124-196 ⁇ g, or about 12.4-19.6% by weight, of IBP after 8 hours.
- the silicone based formulations prepared in Exs. 1-3A delivered about 50-100 times more IBP than the Eudragit® E100 based formulations prepared in Exs. 10-12.
- the flux profile of the Eudragit® S100 based formulations prepared in Exs. 13-15 is slightly better than that of the benchmark. Unlike silicone based formulations or the benchmark, it took the Eudragit® S100 based formulations almost 2 hours to deliver any significant flux to the skin; between about 2 hours to about 8 hours after application, those formulations delivered about 13 ⁇ g/cm 2 /hr to the skin membrane. As seen in Table 5 the Eudragit® S100 based formulations resulted in between about 52 and 57 ⁇ g, or about 5.2 and 5.7% by weight of the drug being delivered to the skin after 8 hours.
- the Eudragit® S100 based formulations While the amount released by the Eudragit® S100 based formulations delivered a higher amount of the drug than the benchmark, the Eudragit® S100 based formulations delivered a significantly lower amount of the drug than the silicone elastomer blend based formulations Exs. 1-3A, which delivered a cumulative amount of about 124-196 ⁇ g, or about 12.4 to 19.6% by weight, of the drug after 8 hours. In other words, the silicone elastomer blend formulations prepared in Exs. 1-3A delivered about 2.5-4 times more drug than the Eudragit® S100 based formulations
- Eudragit L100 formulations prepared in Exs. 16-18 and Eudragit® L100-55 based formulations prepared in Exs. 19-21 exhibited similar flux profiles to Eudragit® S100 based formulations and delivered between about 10-13 ⁇ g/cm 2 /hr between about 2 hours to about 8 hours after application.
- the Eudragit® L100 and L100-55 based formulations resulted in between about 36 and 64 ⁇ g, or about 3.6 and 6.4% by weight of the drug being delivered to the skin after 8 hours.
- silicone elastomer blend formulations prepared in Exs. 1-3A delivered about 2 to about 5 times more IBP to the skin after 8 hours than the Eudragit® L100 and L100-55 based formulations.
- the Eudragit® polymer based formulations Exs. 13-21 delivered a higher cumulative amount of the drug to the skin after 8 hours than the benchmark. However, those formulations delivered a smaller amount of the drug to the skin than the benchmark after 1 hour. For this particular pain reliever drug (IBP), a quicker release of the drug is more beneficial to the patient to relieve the pain quicker.
- the silicone based formulations prepared in Exs. 1-3A not only showed a higher release after 1 hr as compared to the benchmark, but also showed a higher cumulative release after 8 hours as compared to the benchmark and formulations of
- Formulation Ex. 22 was prepared by weighing 0.0397 g of DCF in a speed mixer cup followed by the addition of 0.9193 g of I PA, 0.4528 g of PG and 0.0503 g of OLAC. The cup was closed with a lid and was gently mixed using a vortex mixer until the DCF was completely dissolved. Into the same cup, 2.5076 g of SEB1 with 26.2% solids content was added and the cup was closed with the lid. The cup was mixed in the speed mixer until a homogeneous material was obtained. The formulation material was mixed using spatula in between mixing cycles to achieve the homogeneous formulation.
- Exs. 23-26 were prepared using a similar procedure to that described above by changing the amount of individual components as shown below in Table 6. Exs. 27 and 28 were prepared in a similar manner, but using SEB2 with 26% solids content.
- FIG. 8 also shows the flux profile for the commercially available benchmark, Voltaren®, applied in the same amount, 20 mg, to the same amount (area) of the skin membrane.
- the flux experiment was carried out at the same time using the same conditions for all the formulations and for the benchmark.
- the flux profile for the formulation Exs. 27-28 is provided in FIG. 9.
- FIG. 9 also shows the flux profile for the benchmark, Voltaren®, applied in the same amount, about 20 mg, to the same amount (area) of the skin membrane.
- the Voltaren® benchmark delivers less than about 1 ⁇ g/cm 2 /hr to the skin membrane throughout the 8-hour testing period. Moreover, as can be seen from Table 10 below, the benchmark delivered a cumulative amount of about 2.67 ⁇ g after 8 hours, which represents only about 1.33% by weight of the drug that is present in the benchmark. The benchmark exhibits a relatively flat flux profile throughout the 8-hour period. Silicone-containing formulations prepared in Exs. 22-28 deliver a significantly higher amount of DCF to the membrane than the benchmark at any point throughout the 8-hour period and cumulatively, as seen in FIGs. 8 and 9 and Table 10. The cumulative release after 8 hours of the formulation prepared in Ex.
- Formulation Ex. 29 was prepared by weighing 0.0025 g of CLP in a speed mixer cup followed by the addition of 1.4352 g of IPA, 0.4762 g of PG and 0.0529 g of OLAC. The cup was closed with a lid and was gently mixed using a vortex mixer until the CLP was completely dissolved. Into the same cup, 3.0082 g of SEB1 (with 26.2% solids content) was added and the cup was closed with the lid. The cup was mixed in the speed mixer until a homogeneous material was obtained. The formulation material was mixed using a spatula in between the speed mixer mixing cycles to achieve the homogeneous formulation.
- Formulation ex. 30 was prepared using a similar procedure described above by changing the amount of individual components and using SEB2 with a 26% solids content as shown in Table 7 below.
- Formulation Ex. 31 was prepared by weighing 0.2009 g of Carbopol® 971 P NF in a speed mixer cup followed by the addition of 3.5088 g of IPA. The mixture was mixed gently in a vortex mixer followed by the addition of 1.5159 g of water. After the addition of water, the contents of the cup were mixed well again in the speed mixer. Into the same cup, 0.4528 g of PG, 0.0503 g of OLAC and 0.0029 g of CLP were added and the contents of the cup were mixed well using the speed mixer to get a homogeneous clear formulation in which the CLP was completely dissolved.
- the compositions of Exs. 29-31 are shown in Table 7 below.
- the permeability behavior, the flux (or the amount of CLP delivered through skin per unit area per unit time, (ng/cm 2 /hr)) of the CLP from the above formulations was determined using Franz cell permeability experiment set-up at 32°C using epidermis of human cadaver skin as described earlier. The experiment was conducted for a total of 30 hrs. A Clobetasol propionate 0.05% USP ointment benchmark, was used for comparison.
- FIG. 10 shows the flux profile for the commercially available benchmark product (Clobetasol propionate 0.05% ) applied in the same amount, 20 mg, to the same amount (area) of the skin membrane.
- the flux experiment was carried out at the same time using the same conditions for all the formulations and for the benchmark.
- the silicone-containing formulation examples deliver the CLP significantly better than the commercial benchmark and the formulation Ex. 31 prepared using Carbopol® 971 P NF instead of SEB1 or SEB2. Neither the benchmark nor the formulation Ex. 31 exhibited a burst effect.
- the commercial benchmark delivered about 21 14 ng or 21.14% by weight of CLP to the membrane.
- the Carbopol® containing formulation Ex. 31 delivered about 518 ng or 5.17% by weight of CLP to the membrane.
- Formulation Ex. 29 that included SEB1 delivered about 2498 ng or 24.98% by weight of CLP to the membrane, about an 18% improvement over the benchmark.
- Formulation Exs. 32-34 were prepared using SGM, as shown below in Table 8.
- Formulation Ex. 32 was prepared by weighing 0.0506 g of SGM in a scintillation vial followed by the addition of 0.5005 g of IBP and 9.4523 g of HMDS. The vial was closed with a lid and the contents were mixed using vortex mixer. The IBP was not completely dissolved in the resulting solution; instead, it was dispersed in the solution.
- Exs. 33 and 34 were prepared using a similar procedure to that described above by changing the amount of individual components as shown below in Table 8.
- FIG. 1 1 The flux profile showing the cumulative amount of the drug delivered to the membrane during the 24 hour experiment for the formulation Exs. 32-34, 2, and 3A is provided in FIG. 1 1 .
- FIG. 1 1 also shows the cumulative amount of the drug delivered during different stages for the Ibutop benchmark, applied in the same amount, to the same amount (area) of the skin membrane.
- the permeability experiment was carried out at the same time using the same conditions for all the formulations and for the benchmark. 10 mg of each formulation and the benchmark was applied to the skin of Donor 1 1 (see Table 10 below).
- the silicone elastomer blend containing formulations 2 and 3A deliver the IBP to the membrane significantly better than the SGM containing formulation Exs. 32-34 and the commercial benchmark Ibutop. After 24 hours, the commercial benchmark delivered about 4 ⁇ g or 1 .17% by weight of IBP to the membrane.
- SGM containing formulation Exs. 32 and 33 delivered about 7 ⁇ g or about 1.37% by weight of the drug to the membrane and formulation Ex. 34 delivered about 5 ⁇ g or about 0.95% by weight of the drug to the membrane.
- silicone elastomer blend containing formulation examples deliver IBP significantly better than both the commercial benchmark Ibutop 5% and the SGM containing formulations.
- Formulation Ex. 35 was prepared by weighing 0.0504g of SGM in a scintillation vial followed by addition of 0.0505 g of HCO and 9.9046 g of HMDS. The vial was closed with a lid and mixed using a vortex mixer. The HCO was not dissolved, but was dispersed in the solution.
- Formulation Exs. 36 and 37 were prepared using a similar procedure to that described above by changing the amount of individual components as shown below in Table 8.
- Silicone elastomer based formulation Exs. 38 and 39 were prepared similar to Exs. 2 and 3A, respectively. HCO was used in formulation Exs. 38 and 39 instead of IBP in formulation Exs. 2 and 3A. The compositions of Exs. 35-39 are presented in Table 9 below.
- the cumulative amount of HCO delivered across the skin, (or the total amount of HCO delivered through skin per unit area (ng/cm 2 ) for the entire experimental period of 24 hours) by the formulations 35-39 was determined using Franz cell permeability experiment set-up at 32°C using epidermis of human cadaver skin as described earlier. A benchmark product (Hydrocortisone 0.5% cream) was also included in the experiment. The permeability experiment was conducted using same conditions at the same time using the same skin epidermis for all the formulations.
- FIG. 12 shows the cumulative amount of the drug delivered for benchmark product (Hydrocortisone 0.5% cream), applied in the same amount, to the same amount (area) of the skin membrane.
- the permeability experiment was carried out at the same time using the same conditions for all the formulations and for the benchmark. 10 mg of each formulation and the benchmark was applied to the skin of Donor 12 (see Table 10 below).
- the silicone elastomer blend containing formulations 38 and 39 deliver the HCO to the membrane significantly better than the SGM containing formulation Exs. 35-37 and the benchmark Hydrocortisone 0.5% cream. After 24 hours, the benchmark delivered about 18 ng or 0.034% by weight of HCO to the membrane.
- SGM containing formulation Exs. 35 and 36 delivered about 7 and 8 ng, respectively, or about 0.014 and 0.016% by weight of the drug to the membrane, respectively.
- Formulation Ex. 37 delivered about 4 ng or about 0.0084% by weight of the drug to the membrane.
- silicone elastomer blend containing formulation examples deliver HCO significantly better than both the commercial benchmark Hydrocortisone 0.5% and the SGM containing formulations.
- Silicone elastomer based formulation Exs. 40-42 were prepared similar to formulation Ex. 2 using the same formulation composition but with different IBP concentration. IBP concentration in formulation Exs. 40, 41 , and 42 was 2, 3, and 4%, respectively. The compositions of formulations Exs. 40-42 are presented in Table 1 1 below.
- Table 1 Composition of formulation Exs. 40-42.
- FIG. 13 shows the flux profile for formulation Exs. 40-42 along with that for the benchmark (Ibutop 5% gel). The flux experiment was carried out at the same time using the same conditions for all the formulations and the bench mark. About 20 mg of the formulations prepared in Exs. 40-42 was applied to the membrane of Donor 13.
- silicone organic elastomer blend containing formulation Ex. 41 that includes 3% IBP is about seven times higher than that of the commercial benchmark including 5% IBP.
- the cumulative release after 8 hours of the silicone organic elastomer blend containing formulation Ex. 42 that includes 4% IBP is about eleven times higher than that of the commercial benchmark including 5% IBP.
Abstract
Description
Claims
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US201261639611P | 2012-04-27 | 2012-04-27 | |
PCT/US2013/030212 WO2013162723A1 (en) | 2012-04-27 | 2013-03-11 | Topical formulation compositions containing silicone based excipients to deliver actives to a substrate |
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EP13713613.1A Withdrawn EP2841106A1 (en) | 2012-04-27 | 2013-03-11 | Topical formulation compositions containing silicone based excipients to deliver actives to a substrate |
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US (1) | US20150141389A1 (en) |
EP (1) | EP2841106A1 (en) |
JP (1) | JP6093007B2 (en) |
CN (1) | CN104271160B (en) |
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WO (1) | WO2013162723A1 (en) |
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US11617727B2 (en) | 2019-04-30 | 2023-04-04 | Bayer Healthcare Llc | Topical analgesic gel compositions |
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CN105012228B (en) * | 2015-08-17 | 2018-04-20 | 郑州和济生物科技股份有限公司 | Prevent the sodium hyaluronate Silica hydrogel composition and preparation method of scar formation and Complicated primary |
GB201616223D0 (en) * | 2016-09-23 | 2016-11-09 | University College Cardiff Consultants Limited | Topical treatment patch |
JP2020508993A (en) * | 2017-02-15 | 2020-03-26 | ボタニクス ファーマシューティカルズ リミテッド | Compositions for treating acne |
US11452701B2 (en) | 2017-12-04 | 2022-09-27 | Johnson & Johnson Consumer Inc. | Topical emulsion composition containing nonsteroidal anti-inflammatory drug |
JP2021512067A (en) * | 2018-01-24 | 2021-05-13 | ボタニクス ファーマシューティカルズ リミテッド | Cannabinoid Dosing Regimen for Acne |
US20190224137A1 (en) * | 2018-01-24 | 2019-07-25 | Botanix Pharmaceuticals Ltd. | Cannabinoid Dosing Regime for Acne |
AT521126A2 (en) * | 2018-03-29 | 2019-10-15 | Bcsk Biocid Gmbh | Sprühpflasterzusammensetzung |
WO2019213142A1 (en) * | 2018-04-30 | 2019-11-07 | Eleblend Llc | Cosmetic compositions |
US11304416B2 (en) * | 2018-09-24 | 2022-04-19 | Relevo Labs, Llc | Cyclopentasiloxane and cationic biocide as a formulation additive to enhance persistent sanitizing and miscibility |
TWI691343B (en) * | 2019-05-02 | 2020-04-21 | 邵明遠 | Use of liquid bandage composition |
WO2021061913A1 (en) * | 2019-09-27 | 2021-04-01 | Encube Ethicals, Pvt. Ltd. | Diclofenac sodium topical solution |
WO2023007275A1 (en) * | 2021-07-29 | 2023-02-02 | 3M Innovative Properties Company | Film-forming compositions comprising salicylic acid and methods of use |
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US20100099766A1 (en) * | 2008-10-16 | 2010-04-22 | Novartis Ag | Topical NSAID compositions having sensate component |
WO2011113000A1 (en) * | 2010-03-11 | 2011-09-15 | Chemsmart, Llc | Novel ester containing compositions and methods |
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- 2013-03-11 WO PCT/US2013/030212 patent/WO2013162723A1/en active Application Filing
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WO2005123092A1 (en) * | 2004-06-17 | 2005-12-29 | Galderma S.A. | Composition for the treatment of psoriasis comprising a silicone agent, a corticosteroid and vitamin d or a derivative thereof |
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US20150141389A1 (en) | 2015-05-21 |
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